Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

comment on

( [id://3333] : superdoc . print w/replies, xml ) Need Help??
You could use a SysV IPC to do this. It provides semaphores for locking and persistent shared memory for sharing data. I use it for one project and it is very fast, though I don't recall the benchmark numbers. See perlipc, shmget, and IPC::SysV.

You could also use Sys::Mmap, but you would have to figure out something else for locking. lockf should work fine; it would surprise me if this were very slow if done carefully.

Finally, you could write just the counter part in C, and use mmap to store the counters and atomic operations for consistency. Intel's threading building blocks provide a useful way to do this on Intel hardware, but most modern hardware has something like this. Using Inline::C it's not too hard to mix Perl and C.

Good luck!


In reply to Re: Multiple write locking for BerkeleyDB by sgifford
in thread Multiple write locking for BerkeleyDB by dino

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.